I have somewhere in the neighborhood of 20-40 addons using LibSharedMedia for fonts, bar textures, borders, backgrounds, and sounds and haven't had any crashes. Most likely, either you have some addon using the "MONOCHROME" font flag (it's
been a known
issue for
quite a long time, and while it's been claimed to be fixed on multiple occasions, it keeps coming back) or you have some media file registered with LibSharedMedia that's corrupted in some way that crashes the client.
If you're using a "media pack" addon that registeres a bunch of fonts/textures/etc. I'd start by disabling that and see if the problem goes away. If it doesn't, proceed with a
binary search to narrow it down. If you're not able to figure it out on your own, it may be helpful to
post a list of your addons.